See this situation can be intermediating but its not impossible. Let me assure you if you are hardworking and if you have the perseverance and sincerity then you will definitely crack it.

As you say you have wasted 11 that means that you didn't have good preparation in your 11th. Now as you know JEE has equal weightage from 11 and 12 syllabus so you have to prepare both.

Now the most important for JEE is that you need to focus on 10+2 as well as JEE. Thus you have to cover up both the portions simultaneously. Suppose the tution teachers or your school teachers will be teaching you the 10+2 syllabus, go through it in such that you prepare the syllabus of JEE as well as 10+2. This way at the end you will finish both the 10+2 syllabus as well as JEE 10+2 part. Now for the part of 11 you have invest some time every day to clear your backlogs. If you can study in bits both the 11 and 12 syllabus then by January you will complete 100% of 10+2 and JEE 10+2 part and 90% of the JEE class 11 part. Now depending on your preparation you can invest more time to class 11 and try on practicing problems which will really help you to have a great preparation.

The confusion regarding the books can be solved in a mental approach. I would say you should read the theories from the book you understand. Many students feel hard to read NCERT and they won't feel comfortable with NCERT's. So I would recommend you to study from any book which you can understand from it and for problems you have consider the standard books. Also don't be dependent on the study materials very much. Its a classic mistake which you shouldn't repeat.

For 11th and 12th standard you have to know the theories particularly for Physics. So do study it compulsively. Now as you have less time then I would say study HCV and just go with DC PANDEY mechanics. As DC PANDEY mechanics has a lot of solved problems you will learn the problem solving skills as well as the theories more definitively. For Chemistry you can go for NCERT as well as P.BAHADUR for Physical Chemistry. This book have good summary which you can understand easily and have a lot of problems which will strengthen your concepts. For Mathematics you should follow Amit. M. Aggarwal at least as for Mathematics NCERT isn't sufficient. Also if you have JEE books like JEE at your Fingertips etc you can use them for problem practice and not rely on them too much as they contain a lot of conceptual as well as printing mistakes.

To know more about JEE MAINS preparation strategy visit the link below:

https://engineering.careers360.com/articles/1-year-study-plan-for-jee-main

Also preparation can be really easy if you have good guidance. So having a good teacher or a institution can be really helpful. Career360 offers some really good courses for JEE as well as crash courses. So to stay tuned use the career360 app about the courses offered for 2022.

I hope this answer helps. All the very best for your future endeavors!